Hillock Estates, IA
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (monitoring period 2025-2025). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. The latest 90th-percentile result was reported as 0 (not detected at the lab's limit). That says the sampled homes were low, not that your home has no lead service line. Check your utility's service line inventory for your address.
Who runs the water here
Hillock Estates serves about 228 people through 91 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws surface water, in Polk County, Iowa. EPA system ID: IA7727608; phone on file: 641-891-2051. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Every lead result on file
Against the period ending 2025 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Hillock Estates is 0 ppb across 2 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2025 | 0 (not detected) |
Against other Iowa systems
Of the 1,066 Iowa systems with a lead result, the median latest reading is 1.4 ppb; 4 are over 15 ppb right now and 36 have gone over at some point. Hillock Estates's reported as 0 (not detected) sits at the 12th percentile in Iowa and the 16th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Nearby utilities
34 other systems share Polk County; 9 of them have a higher latest lead result than Hillock Estates. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Des Moines Water Works | 246,055 | 0 (not detected) |
| Ankeny, City Of | 76,207 | 0 (not detected) |
| Urbandale Water Utility | 45,605 | 0 (not detected) |
| Johnston Municipal Water Supply | 24,897 | 0 (not detected) |
| Altoona Water Supply | 22,436 | 5.6 ppb |
| Clive Water Department | 20,277 | 0 (not detected) |
| Grimes Water Supply | 17,997 | 0 (not detected) |
| Bondurant Muni Water Supply | 9,393 | 1.3 ppb |
| Southeast Polk Rwd | 7,565 | 0 (not detected) |
| Polk City Water Supply | 6,533 | 1.3 ppb |
Next steps for Knoxville, IA
Look up your address in Hillock Estates's service line inventory. If it says lead, galvanized or unknown, test your tap. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Hillock Estates whether it covers that cost before hiring anyone - many utilities now do.
These figures describe homes the utility sampled, not your tap. Only your service line record or a test of your own water answers the question for your house. What a 90th-percentile result does and does not tell you: how to read a lead result. A zero today does not rule out a jump later - the rules are tightening in 2027.